I've just had a frame coated by ctc-powder-coating.co.uk in Essex. Total cost, including next day courier return came to just over £80, with a metal flake lacquer top coat and primer.
I've gone for stove finishes in the past but for the money, I'd definitely have powder coating again. The only caveat is that I had to put an evening aside with a Swiss file to get the overspray off the down tube bosses and smooth out the drop outs - other than that, it comes up a treat. The one thing I did find, when fitting wheels and tightening up the front mech is that powder coat tends to 'absorb' marks rather than chip and flake.
'Killing me won't bring back your apples'